Protection

Figure 2 UEM state diagram

The text below explains the state diagram. The symbol means that the voltage rises and that the voltage drops. Means the result of the conditions set on the left most side.

VBAT < Vmstr VBAT < Vmstr

VBAT ^ Vmstr+ VBAT > Vmstr VBAT ^ Vmstr+ PWRONX 2 '0 '

VBAT > Vcoff+ DELAY2 elapses VBAT > Coff+. DELAY4 elapses SLEEPX 2'0 ' SLEEPX2'1' VBAT ^ Vcoff No change VBAT > Vmstr

PWRONX ^ detection during DELAY2 Watchdog elapses (approx. 100 (s) Thermal shutdown PwrKeyWatchdog (4 sec.) elapses and VBACK > V_BUcoff and VBACK < V_BUcoff and VBACK < V_BUcoff and DELAY1 elapses and VBACK > V_BUcoff or VCHAR 7I VCHARdet+ orALARM 2 '1'

and DELAY3 elapses and VBAT > Vmstr-

^ DELAY1 ^ DELAY2 ^ DELAY3 ^ DELAY4 ^ PWR_0N ^ SLEEP ^ PWR_0N ^ PWR_0FF

^ Stay in PWR_0FF ^ PWR_0FF ^ PWR_0FF ^ PWR_0FF ^ PWR 0FF

The different states ofthe UEM are detailed in the sections below. No Supply

In the NO_SUPPLY mode the UEM has no supply voltage (VBAT < VMSTR and VBACK < V_BUcoff-). This mode is due to the fact that both the main battery and the backup battery are either disconnected or both discharged to a low voltage level.

The UEM will recover from NO_SUPPLY into RESET mode ifthe VBAT voltage level rises above the Vmstr+ level by either reconnecting the main battery or charge it to such level.

Backup

In BACK_UP mode the main battery is either disconnected or has a low voltage level (VBAT < VMSTR- and VBACK > V_BUCOFF+).

The regulator VRTC that supplies the real time clock is disabled in BACK_UP mode. Instead the unregulated backup battery voltage VBACK supplies the output of the VRTC. All other regulators are disabled and the phone has no functionality.

The UEM will recover from BACK UP mode into RESET mode ifVBAT rises above V

Power Off

In order for the UEM to be in PWR_OFF mode, it must have supply voltage (VBAT > VMSTR+).

The regulator VRTC regulator is enabled and supplying the RTC within the UEM. The UEM will enter RESET mode after a 20 ms delay whenever one of the below listed conditions is logically true:

• The power button is activated

• Charger connectionisdetected

• RTC alarmisdetected

The UEM will enter PWR_OFF from all other modes except NO_SUPPLY and BACK_UP if the internal watchdog elapses.

Reset

When the UEM enters RESET mode from PWR_OFF mode the watchdog is enabled. If the VBAT fails to rise above the power-up voltage level Vcoff+ (3.1 V) before the watchdog elapses, the UEM will enter PWR_OFF mode. Otherwise after a 200 ms delay the regulator VFLASH1 will be enabled and after an additional delay of 500 |s the regulators VANA, VIO, VCORE and VR3 will be enabled. All other regulators i.e. VFLASH2, VSIM, VR1, VR2 and VR4 - VR7 are software controlled and disabled by default. After an additional delay of 20 ms the UEM enters PWR_ON mode.

Power On

In PWR_ON the UEM is fully functional in the sense that all internal circuits is powered up or can be by means of software. The UEM will enter PWR_OFF mode ifVBAT drops below Vcqof- for a period of time longer than 5 |is. The UEM will furthermore enter PWR_OFF mode if either of the watchdogs Operational State Machine (approx. 100 |s), Security (32 sec.) or Power Key (4 sec.) elapses or if any of the regulators triggers the thermal protection circuitry

Sleep

The UEM can be forced into SLEEP mode by the UPP by setting the input SLEEPX low for more than 60 |s. This state is entered when the external UPP activity is low (phone in sleep) and thereby lowering the internal current consumption of the UEM. The regulator VANA is disabled and VR1 - VR7 are either disabled or in low quiescent mode.

From SLEEP the UEM enters PWR_ON if SLEEPX goes high, PWR_OFF mode if watchdog elapses or BACK_UP mode ifVBAT drops below Vmstr-.

Protection Mode

The UEM has two separate protection limits for over temperature conditions, one for the charging switch and one for the regulators. The temperature circuitry measures the on-chip temperature. In case of charging over temperature, the circuit turns the charging switch off. In case ofovertemperature in any of the regulators, the UEM powersoff.

Battery BL-4C

Product NPL-2 uses the so called "case-less" Li Ion battery BL-4C. BL-4C battery capacity is 720mAh.

Main advantage of case-less battery types is the overall size, particular the thickness and the number of contact terminals.

This battery has a three-pin connector (BTEMP is not used). The battery does not support temperature measurement inside battery pack. In order to get temperature information of the battery, a NTC is mounted on the PWB within the BB area.

Ni based batteries are not supported by NPL-2.

The resistor value for battery size indication (BSI) is 68 kOhm.

RTC Capacitor

To sustain the RTC when BL-4C is removed from the phone, a backup capacitor is used in NPL-2. This capacitor is soldered directly to the PWB. Its capacity is 0.01 mAh. This provides approx. 2.9 hours of backup time.

Power Distribution

Under normal conditions, the battery powers the baseband module. Individual regulators located within the UEM regulate the battery voltage VBAT. These regulators supply the different parts of the phone. 8 regulators are dedicated to the RF module of the phone, and 6 to the baseband module.

The VSIM regulator is able to deliver both 1.8V and 3.0V DC and thus supporting two different SIM technologies. A register internally in the UEM controls the output of VSIM and can be written to by the MCU via the CBUS.

The regulator VCORE is likewise adjustable and controlled by registers written by the MCU. VCORE supplies the core of the UPP and can be adjusted on the fly by the MCU if DSP capacity is inadequate. Higher VCORE supply (1.8 V) results in faster core operations in the UPP.

The regulator VFLASH2 supplies audio circuitry and is controlled by the MCU

Regulators VANA, VFLASH1 and VIO are solely controlled by the UEM and cannot be enabled or disabled by the MCU. Furthermore, VFLASH1 and VIO are both ON, though in low quiescent mode when phone is in sleep mode. An output current of 500 ^A can be drawn from the regulators. VIO supplies the UPP, FLASH and LCD, VFLASH1 supplies LCD and the IrDA module. VANA is supplying analogue parts internally in the UEM as well as the baseband audio circuitry and pull-up resistors on the input of the UEM slow AD converters.

System connector provides a voltage to supply accessories. The white LED's need a higher voltage supply as the battery can provide in bad condition. Separate external regulators supply both consumers.

The regulators VR1A, VR1B, VR2 - VR7 and IPA1 - IPA4are controlled by the DSPvia the DBus. VR4 - VR7 are controlled by the UEM as well and are disabled in sleep regardless of DSP writings.

VBAT is furthermore distributed, unregulated, to the RF power amplifier, audio power amplifier and external baseband regulators.

The CHACON module in the UEM controls the charging of the main battery. Furthermore itcontainsa 3.2 Vdc regulator for charging of the backup batteryand a 1.8 Vdc regulator supplying the internal real time clock.

Baseband

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